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Opioids And The Opioid Receptor Essay

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Opioids
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Introduction
What are Opioids?
Opioids are compounds that adhere to the opiate receptors. The term, however, is often used to describe the alkaloid opioids, which are extracted from the opium poppy. Such alkaloids include codeine and morphine. Moreover, opioids include the drugs that are manufactured from the naturally occurring opiates. Such semi-synthetic opiates include heroin, which is prepared from morphine, and oxycodone, which is synthesized from thebaine. Synthetic opioids, however, include methadone, propoxyphene, and fentanyl (Rosenblum, Marsch, Joseph, & Portenoy, 2008).
Mechanism of Action
Opioids act by adhering to the opioid receptor proteins. The receptors are involved in the pain modulation process and occur in both the central and the peripheral nervous systems. In addition, the receptors bind endorphins or endogenous opioid peptides, which modulate pain in the body. Endogenous peptides are also involved in the modulation of mood and stress, as well as the reward and reinforcement mechanisms. In studies involving rats (Raghavendra, Rutkowski, & DeLeo, 2002), the activation of the opioid receptors with Morphine produces effects such as the sensitization of sensory nerves to the noxious stimuli.
Analgesia occurs when an opioid is clinically administered, but may be accompanied by the side effects related to receptor activation. The effects may be mediated by the central or peripheral nervous system, and include

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